{"gene":"CEP290","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2006,"finding":"CEP290 localizes to centrosomes in dividing cells and to the connecting cilium of retinal photoreceptors, where it associates with microtubule-based transport proteins including RPGR; an in-frame deletion in CEP290 (rd16 mouse) causes stronger association with specific RPGR isoforms and redistribution of RPGR and phototransduction proteins in photoreceptors, implicating CEP290 in ciliary transport.","method":"Immunolocalization, co-immunoprecipitation, immunogold electron microscopy, mouse genetic model","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, immunogold EM, genetic model) in a single rigorous study","pmids":["16632484"],"is_preprint":false},{"year":2006,"finding":"CEP290 expression shows centrosome and ciliary localization, linking it to ciliopathies; mutations in CEP290 cause pleiotropic Joubert syndrome features including cerebellar, retinal, and renal manifestations.","method":"Expression analysis, immunolocalization in cerebellar granule neurons","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization experiment but limited functional mechanistic follow-up","pmids":["16682970"],"is_preprint":false},{"year":2008,"finding":"CEP290 physically interacts with the centriolar satellite protein PCM-1; CEP290 localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner; depletion of CEP290 disrupts PCM-1 distribution and protein complex formation, disorganizes the cytoplasmic microtubule network, impairs ciliogenesis, and prevents ciliary targeting of Rab8.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus multiple functional readouts (microtubule organization, ciliogenesis, Rab8 localization)","pmids":["18772192"],"is_preprint":false},{"year":2008,"finding":"CP110 interacts with CEP290 in a discrete complex separable from other CP110 complexes; this interaction is required for CP110 to suppress primary cilia formation; CEP290 and CP110 also interact with Rab8a, and depletion of CEP290 prevents Rab8a localization to centrosomes and cilia, blocking ciliogenesis without affecting centrosome function or cell-cycle progression.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with multiple functional assays showing epistatic relationship between CP110 and CEP290","pmids":["18694559"],"is_preprint":false},{"year":2008,"finding":"CC2D2A physically interacts with CEP290 at the basal body as shown by yeast two-hybrid and GST pull-down; knockdown of cep290 in cc2d2a-mutant zebrafish produces a synergistic pronephric cyst phenotype, revealing a genetic interaction between the two proteins.","method":"Yeast two-hybrid, GST pull-down, zebrafish genetic epistasis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro reconstitution (GST pulldown) plus in vivo genetic epistasis","pmids":["18950740"],"is_preprint":false},{"year":2008,"finding":"The N-terminal domain of nephrocystin-6 (CEP290) directly binds nephrocystin-5 (NPHP5); mapping studies delineated the interaction site to amino acids 696–896 of NPHP6; expression of the nephrocystin-5-binding fragment of nephrocystin-6 in Xenopus phenocopies NPHP5 knockdown and is rescued by co-expression of nephrocystin-5, supporting a physical interaction in vivo; N- and C-terminal fragments of nephrocystin-6 form homo- and heteromeric complexes.","method":"Co-immunoprecipitation, domain mapping, Xenopus morpholino knockdown and rescue, zebrafish knockdown","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — domain-level mapping plus in vivo epistasis in two model organisms","pmids":["18723859"],"is_preprint":false},{"year":2010,"finding":"In Chlamydomonas, CEP290 is located in the flagellar transition zone in close association with microtubule-membrane links; deletion of CEP290 causes loss of attachment of the flagellar membrane to transition zone microtubules, produces abnormal flagellar protein content (including IFT proteins and ciliopathy-associated proteins), and CEP290 at the transition zone undergoes rapid turnover. CEP290 is required to form microtubule-membrane linkers and to control flagellar protein composition.","method":"Immunoelectron microscopy, ultrastructural analysis, biochemical fractionation of isolated flagella, dikaryon experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — ultrastructural and biochemical reconstitution in a genetic deletion model with multiple orthogonal methods","pmids":["20819941"],"is_preprint":false},{"year":2007,"finding":"In olfactory sensory neurons, CEP290 localizes to dendritic knobs and is in complex with ciliary transport proteins and olfactory G proteins Golf and Gγ13; hypomorphic CEP290 mutation (rd16) causes selective loss of ciliary localization of Golf and Gγ13 but not of odorant receptors or other signaling components, implicating CEP290 as a key mediator of selective G protein trafficking into olfactory cilia.","method":"Electro-olfactogram recordings, co-immunoprecipitation, immunofluorescence, mouse genetic model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — co-IP plus functional electrophysiology plus selective localization phenotype in genetic model","pmids":["17898177"],"is_preprint":false},{"year":2012,"finding":"Cep72 is required for recruitment of CEP290 to centriolar satellites; interactions between PCM1, Cep72, and Cep290 were identified; disruption of centriolar satellites impairs ciliary localization of BBS4 in a Cep290- and Cep72-dependent manner, indicating that Cep290 and Cep72 in centriolar satellites regulate ciliary localization of the BBSome.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish loss-of-function","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional ciliogenesis and BBSome trafficking assays","pmids":["22767577"],"is_preprint":false},{"year":2013,"finding":"CEP290 directly binds cellular membranes through an N-terminal amphipathic helix domain and binds microtubules through a domain within its myosin-tail homology domain; CEP290 activity is regulated by two autoinhibitory domains in its N and C termini; disruption of the microtubule-binding domain in a mouse model induces cilia formation deficits leading to retinal degeneration.","method":"In vitro membrane-binding assay, microtubule-binding assay, domain mutagenesis, mouse genetic model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assays with domain mutagenesis validated in vivo in mouse model","pmids":["24051377"],"is_preprint":false},{"year":2013,"finding":"The BBSome binds to the N-terminal region of CEP290 through BBS4 and co-localizes with CEP290 at the transition zone, centriolar satellites, and connecting cilium; in BBSome-depleted cells, CEP290 localization to centriolar satellites is disrupted; genetic interaction was demonstrated: additional loss of Bbs4 alleles in Cep290rd16 mice accelerates photoreceptor degeneration and increases body weight, and double-heterozygous mice show increased body weight.","method":"Co-immunoprecipitation, immunofluorescence, mouse genetic epistasis (Cep290rd16 × Bbs4-null crosses)","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — co-IP plus in vivo genetic interaction with quantitative phenotypic readouts","pmids":["23943788"],"is_preprint":false},{"year":2012,"finding":"The domain deleted in the Cep290rd16 protein directly interacts with MKKS; MKKS mutations found in Bardet-Biedl syndrome patients disrupt this interaction; combined subminimal knockdown of mkks and cep290 in zebrafish produces synergistic sensory defects; combinations of Cep290rd16 and Mkksko alleles in mice led to improved ciliogenesis and sensory functions compared with either mutant alone, suggesting that CEP290–MKKS interaction affects integrity of multiprotein complexes at the cilia transition zone.","method":"Co-immunoprecipitation, zebrafish genetic epistasis, mouse double-mutant crosses, ciliogenesis assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — direct binding mapped to specific domain, validated by reciprocal epistasis in two model organisms","pmids":["22446187"],"is_preprint":false},{"year":2013,"finding":"CEP290 depletion leads to accumulation of its novel interacting partner Rkip (Raf-1 kinase inhibitory protein); ectopic accumulation of Rkip causes defective cilia formation mediated by its interaction with the ciliary GTPase Rab8A, suggesting that Rkip prevents cilia formation downstream of CEP290.","method":"Co-immunoprecipitation, zebrafish morpholino knockdown, cell-based ciliogenesis assays, rd16 mouse model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus in vivo phenocopy, but mechanistic link from CEP290 to Rkip to Rab8A shown in separate experiments","pmids":["21685394"],"is_preprint":false},{"year":2014,"finding":"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome; Cep290 directly binds NPHP5, and depletion of Cep290 causes dissociation of BBS8 from the BBSome and loss of ciliary BBS8 in addition to the BBS2/5 loss caused by NPHP5 depletion; selective impairment of BBSome cargo (smoothened, VPAC2, Rab8a) delivery to cilia occurs upon NPHP5 or Cep290 loss.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — direct binding demonstrated plus multiple functional readouts of BBSome integrity and cargo trafficking","pmids":["25552655"],"is_preprint":false},{"year":2013,"finding":"Pathogenic NPHP5 truncating mutations produce products unable to bind Cep290 and unable to localize to centrosomes, thereby blocking cilia formation; drugs antagonizing negative regulators of ciliogenesis rescue ciliation in NPHP5-depleted cells with response profiles similar to those of Cep290-depleted cells, placing NPHP5 and Cep290 in the same early ciliogenic pathway.","method":"Co-immunoprecipitation, domain mutagenesis, siRNA knockdown, pharmacological rescue, ciliogenesis assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1/2 — direct binding with mutagenesis plus pharmacological epistasis","pmids":["23446637"],"is_preprint":false},{"year":2016,"finding":"In C. elegans, CEP-290 is a central assembly factor specific to MKS module components at the transition zone, depending on the coiled-coil region of MKS-5 (RPGRIP1L) for TZ localization; CEP-290 prevents inappropriate entry of membrane-associated proteins into cilia and prevents ARL-13 from leaking out of cilia; CEP-290-dependent TZ localization was established for TMEM-218, TMEM-138, and CDKL-1.","method":"C. elegans genetic deletion, immunofluorescence localization hierarchies, fluorescent protein reporters for ciliary gating","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — epistatic hierarchy established with multiple proteins in a genetic model organism with functional gating assays","pmids":["26982032"],"is_preprint":false},{"year":2015,"finding":"CEP290 localizes precisely to the transition zone Y-linker region between central microtubules and plasma membrane; Cep290ko/ko mice lacking CEP290 protein have photoreceptors that lack connecting cilia and fail to mature ciliated ventricular ependyma; partial loss of CEP290-interacting ciliopathy protein MKKS mitigates lethality and renal pathology in Cep290gt/gt mice, indicating domain-specific genetic interactions.","method":"Immunofluorescence, mouse genetic knockout, light and electron microscopy","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — direct localization to Y-linkers with in vivo loss-of-function and genetic rescue","pmids":["25859007"],"is_preprint":false},{"year":2016,"finding":"Phenotypic expression of Rpgr-loss in mice is modified by heterozygous hypomorphic but not null alleles of Cep290; physical interaction between RPGR and the C-terminal domain of CEP290 was demonstrated; Rpgrko/Y::Cep290rd16/+ mice show early-onset retinal degeneration with disorganized outer segments and defective opsin trafficking.","method":"Co-immunoprecipitation, mouse double-mutant crosses, immunofluorescence, electroretinography","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — co-IP mapping to specific domain plus quantitative in vivo genetic interaction","pmids":["26936822"],"is_preprint":false},{"year":2015,"finding":"DNA replication stress underlies renal phenotypes in CEP290-associated ciliopathy; reduction of CEP290 in kidney cells and zebrafish leads to enhanced DNA damage signaling, DNA breaks, supernumerary centrioles, decreased replication fork velocity, fork asymmetry, and increased CDK levels; CDK inhibitor treatment rescues DNA damage, centriole number, and primary cilia loss in Cep290-deficient cells.","method":"DNA fiber assay, γH2AX staining, CDK inhibitor treatment, 3D spheroid culture, zebrafish knockdown","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods linking CEP290 to DNA replication stress with pharmacological rescue","pmids":["26301811"],"is_preprint":false},{"year":2017,"finding":"CEP290 acts as a selective ciliary gatekeeper: in JSRD patient fibroblasts lacking CEP290, cilia are abnormal with decreased ciliogenesis and selectively reduced localization of ADCY3 and ARL13B; Hedgehog signaling is augmented due to enhanced ciliary transport of Smoothened and GPR161, demonstrating that CEP290 controls selective entry and exit of signaling molecules at the ciliary gate.","method":"iPSC-derived optic cups and fibroblasts from patients, immunofluorescence, ciliogenesis quantification, Hedgehog signaling assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — patient-derived cells with multiple orthogonal functional assays demonstrating gatekeeper role","pmids":["28700940"],"is_preprint":false},{"year":2013,"finding":"SSX2IP localizes to the basal body of primary cilia and is required for efficient recruitment of Cep290 to centriolar satellites and the basal body; loss of SSX2IP impairs BBSome entry into cilia, reduces Rab8 accumulation, and reduces ciliary targeting of somatostatin receptor 3.","method":"siRNA knockdown, immunofluorescence, co-immunoprecipitation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — localization dependency established by knockdown with multiple functional readouts","pmids":["24356449"],"is_preprint":false},{"year":2017,"finding":"CCDC66 is a centriolar satellite protein that interacts with CEP290 and PCM1 as shown by co-immunoprecipitation; depletion of CCDC66 impairs ciliogenesis, ciliary recruitment of BBS4, and centriolar satellite organization.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus multiple functional knockdown readouts from a single lab","pmids":["28235840"],"is_preprint":false},{"year":2014,"finding":"Talpid3 and Cep290 play overlapping and distinct roles in cilia formation: both affect Rab8a localization and centriolar satellite dynamics; ultrastructural analyses show Talpid3 is required for centriolar satellite dispersal preceding mature ciliary vesicle formation, a process requiring Cep290; expression of activated Rab8a suppresses cilia assembly defects caused by Talpid3 depletion.","method":"siRNA knockdown, immunofluorescence, electron microscopy, activated Rab8a rescue","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1/2 — ultrastructural analysis plus genetic rescue experiments defining pathway order","pmids":["24421332"],"is_preprint":false},{"year":2018,"finding":"A CEP290 C-terminal fragment (989 residues including the domain deleted in rd16 mice) delivered by AAV complements mutant CEP290 in trans, rescuing cone preservation, delaying rod death, improving cilia phenotypes in mouse embryonic fibroblasts, and improving photoreceptor outer segments in iPSC-derived retinal organoids.","method":"AAV gene delivery, mouse in vivo rescue (Cep290rd16 and rd16;Nrl-/- models), electroretinography, histology, iPSC-derived organoids","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — domain-specific functional rescue in multiple models with quantitative readouts","pmids":["30332642"],"is_preprint":false},{"year":2011,"finding":"The N-terminal region of human CEP290 protein is sufficient to restore visual function in cep290 morpholino-injected zebrafish; cep290 morphants exhibit reduced Kupffer's vesicle size and delayed melanosome transport phenotypes similar to bbs knockdowns.","method":"Zebrafish morpholino knockdown, mRNA rescue, visual function assay","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — domain-level rescue in vivo, single organism","pmids":["21257638"],"is_preprint":false},{"year":2020,"finding":"In Drosophila, the N-terminus of CEP290 directly recruits DZIP1, which then recruits Chibby and Rab8 to promote early ciliary membrane formation; complete deletion of CEP290 blocks ciliogenesis at the transition zone assembly initiation stage, phenocopied by DZIP1 deletion; expression of CEP290 N-terminus alone restores DZIP1 TZ localization and ameliorates TZ assembly initiation defects.","method":"Drosophila genetics, in vivo rescue, immunofluorescence, domain-specific expression","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — epistatic pathway ordering with domain-specific rescue in a genetic model organism","pmids":["33370260"],"is_preprint":false},{"year":2021,"finding":"Rpgrip1l controls ciliary gating by ensuring the proper amount of CEP290 at the vertebrate transition zone; reduction of Rpgrip1l leads to decreased CEP290 at the TZ; the flavonoid eupatilin rescues ciliary gating defects caused by Rpgrip1l loss.","method":"Immunofluorescence in mouse and zebrafish models, pharmacological rescue","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein-level dependency shown in vivo with pharmacological rescue, single study","pmids":["33625872"],"is_preprint":false},{"year":2021,"finding":"Using super-resolution fluorescence microscopy, CEP290 localizes radially between microtubule doublets and the ciliary membrane throughout the full length of the connecting cilium in photoreceptors, but is confined to the very base of primary cilia in RPE1 cells; severe CEP290 deficiency reduces cilia number and prevents normal outer segment formation but does not prevent assembly of Y-shaped links in early stages.","method":"Super-resolution fluorescence microscopy (STORM/STED), electron microscopy, CEP290-deficient mouse models","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 — sub-diffraction localization with structural validation and multiple mutant mouse models","pmids":["34520396"],"is_preprint":false},{"year":2022,"finding":"During aggresome assembly, the seeding of an initial phosphorylated HSP27 ring at the centrosome depends on CP110, CEP97, and CEP290; centriolar satellites are required for aggresome growth from this ring; CP110-CEP97-CEP290 and satellites are also required for aggregation of mutant huntingtin.","method":"High-resolution quantitative microscopy, siRNA knockdown, aggresome formation assays in human cells","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — specific complex identified with functional aggresome assembly readout, single study","pmids":["35411088"],"is_preprint":false},{"year":2025,"finding":"Using advanced microscopy, CEP290 is found throughout the connecting cilium with nine-fold symmetry between microtubules and membrane; in the absence of CEP290, ciliogenesis occurs but the connecting cilium membrane is aberrant, ciliary necklace and Y-links are confined to the proximal connecting cilium, TZ proteins AHI1 and NPHP1 are abnormally restricted to the proximal connecting cilium, outer segment disc formation is inhibited, and large numbers of extracellular vesicles form.","method":"Advanced electron microscopy, immunofluorescence, Cep290 mutant mouse retinas, developmental time-course","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structural analysis plus multiple functional consequences in genetic mouse model","pmids":["40704549"],"is_preprint":false},{"year":2024,"finding":"The Cep131-Cep162 module (near the axoneme) and the Cby-Fam92 module (close to the membrane) synergistically control basal body localization of CEP290 and ciliogenesis initiation in Drosophila; concurrent deletion of any protein from both modules causes complete loss of CEP290 from the basal body and blocks ciliogenesis at its initiation stage.","method":"Drosophila genetics, immunofluorescence, double-mutant analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple double-mutant combinations defining cooperative localization pathway","pmids":["38442096"],"is_preprint":false},{"year":2018,"finding":"A rare CEP290 missense variant (R1747Q/R1746Q) disrupts the ciliary diffusion barrier, causes mislocalization of the Shh receptor Smoothened, dysregulates ciliary protein mobility, and impairs proliferation of cerebellar granule progenitors; confirmed in an autism patient-derived iPSC line.","method":"FRAP, immunofluorescence, Hedgehog signaling assays, mouse and iPSC models","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — FRAP plus functional signaling assays in both mouse and human iPSC model","pmids":["30478281"],"is_preprint":false}],"current_model":"CEP290 is a large coiled-coil protein that localizes to the transition zone (TZ) Y-linker region between axonemal microtubules and the ciliary membrane, where it acts as a selective gatekeeper controlling entry and exit of signaling molecules; it directly binds microtubules via a myosin-tail homology domain and cellular membranes via an N-terminal amphipathic helix, recruits DZIP1/Chibby/Rab8 to initiate TZ assembly, interacts physically with RPGR, NPHP5, PCM-1, CP110, BBS4 (BBSome), and MKKS to regulate centriolar satellite dynamics, ciliogenesis, and ciliary cargo trafficking, and also has a nuclear function linked to DNA replication stress control."},"narrative":{"teleology":[{"year":2006,"claim":"Identification of CEP290 as a centrosomal/ciliary protein whose mutation causes ciliopathy established the gene as a ciliary transport regulator and linked it to Joubert syndrome.","evidence":"Immunolocalization, immunogold EM, co-IP with RPGR in mouse retina; expression analysis in cerebellar granule neurons with patient mutation screening","pmids":["16632484","16682970"],"confidence":"High","gaps":["Molecular mechanism of CEP290-RPGR interaction unresolved","Subciliary localization not yet resolved at nanoscale"]},{"year":2007,"claim":"Demonstration that CEP290 selectively mediates G protein trafficking into olfactory cilia revealed it acts as a cargo-selective gate rather than a general transport factor.","evidence":"Electro-olfactograms, co-IP with Golf/Gγ13, immunofluorescence in rd16 mouse olfactory neurons","pmids":["17898177"],"confidence":"High","gaps":["How CEP290 discriminates between cargo proteins unknown","Structural basis for selectivity unresolved"]},{"year":2008,"claim":"A series of studies mapped CEP290 into a physical interaction network with PCM-1, CP110, NPHP5, CC2D2A, and Rab8a, establishing it as a hub connecting centriolar satellites, the mother centriole cap, and ciliogenesis initiation.","evidence":"Reciprocal co-IP, domain mapping, siRNA knockdown with ciliogenesis and Rab8 localization assays, yeast two-hybrid, GST pull-down, zebrafish genetic epistasis","pmids":["18772192","18694559","18950740","18723859"],"confidence":"High","gaps":["Stoichiometry and temporal order of complex assembly at the basal body undefined","Whether CP110-CEP290 and PCM1-CEP290 complexes coexist or are mutually exclusive unclear"]},{"year":2010,"claim":"Ultrastructural analysis in Chlamydomonas established that CEP290 forms the physical microtubule-membrane links at the transition zone and controls flagellar protein composition, providing the first structural evidence for its gatekeeper role.","evidence":"Immunoelectron microscopy, biochemical fractionation of isolated flagella, dikaryon rescue in CEP290-deletion Chlamydomonas","pmids":["20819941"],"confidence":"High","gaps":["Whether the same ultrastructural role is conserved in vertebrate TZ not yet shown at this point","Molecular architecture of the Y-link with CEP290 unresolved"]},{"year":2012,"claim":"Discovery that CEP290 at centriolar satellites controls BBSome ciliary entry (via Cep72) and that CEP290-MKKS interaction modulates TZ complex integrity revealed how CEP290 coordinates satellite dynamics with ciliary trafficking.","evidence":"Co-IP, siRNA and zebrafish knockdown, mouse double-mutant crosses (Cep290rd16 × Mkks-ko)","pmids":["22767577","22446187"],"confidence":"High","gaps":["How MKKS-CEP290 balance is mechanistically set at the TZ unknown","Whether satellite-independent CEP290 functions exist at the TZ not distinguished"]},{"year":2013,"claim":"Biochemical reconstitution revealed CEP290 directly binds membranes via an N-terminal amphipathic helix and microtubules via a myosin-tail homology domain, with two autoinhibitory domains regulating these activities, providing the first molecular-level mechanism for its bridge function.","evidence":"In vitro membrane-binding and microtubule-binding assays, domain mutagenesis, mouse genetic model with retinal degeneration","pmids":["24051377"],"confidence":"High","gaps":["Structural basis for autoinhibition and its relief unknown","Whether post-translational modifications regulate domain switching untested"]},{"year":2013,"claim":"Multiple studies defined the BBSome-CEP290-NPHP5 axis: BBS4 binds CEP290 N-terminus; CEP290 and NPHP5 jointly maintain BBSome integrity and are placed in the same early ciliogenic pathway by pharmacological epistasis.","evidence":"Co-IP, domain mapping, mouse genetic epistasis (Cep290rd16 × Bbs4-null), pharmacological rescue screens, ciliary cargo assays","pmids":["23943788","23446637","25552655"],"confidence":"High","gaps":["Whether CEP290 acts catalytically or purely as a scaffold for BBSome assembly unclear","Direct structural complex of CEP290-NPHP5-BBSome not reconstituted"]},{"year":2015,"claim":"CEP290 was localized precisely to the Y-linker substructure of the transition zone, and CEP290 depletion was found to cause DNA replication stress independent of its ciliary role, revealing a nuclear/cell-cycle function.","evidence":"Immunofluorescence and EM in mouse knockout; DNA fiber assays, γH2AX staining, CDK inhibitor rescue in kidney cells and zebrafish","pmids":["25859007","26301811"],"confidence":"High","gaps":["Mechanism by which CEP290 regulates replication fork stability unknown","Whether nuclear CEP290 function is direct or mediated by centriole/centrosome defects unresolved"]},{"year":2016,"claim":"C. elegans epistasis hierarchies showed CEP290 is a central MKS-module assembly factor that prevents inappropriate entry of membrane-associated proteins and leakage of ARL-13 from cilia, consolidating the gatekeeper model across species.","evidence":"C. elegans genetic deletions, localization hierarchy mapping, fluorescent ciliary gating reporters","pmids":["26982032"],"confidence":"High","gaps":["Whether CEP290 physically contacts each MKS component or acts indirectly not distinguished","Gating selectivity mechanism at molecular level unknown"]},{"year":2017,"claim":"Patient-derived cells demonstrated that CEP290 loss selectively reduces ciliary ADCY3 and ARL13B while augmenting Smoothened and GPR161 transport, confirming bidirectional gatekeeper function in human disease-relevant tissue.","evidence":"iPSC-derived optic cups and fibroblasts from Joubert syndrome patients, Hedgehog signaling assays","pmids":["28700940"],"confidence":"High","gaps":["Whether augmented Hedgehog signaling directly drives cerebellar phenotype not tested","Mechanism discriminating cargo allowed vs. excluded at the gate unknown"]},{"year":2020,"claim":"Drosophila studies defined the earliest CEP290-dependent step in TZ assembly: the N-terminus recruits DZIP1, which then recruits Chibby and Rab8 to initiate ciliary membrane formation, ordering the pathway.","evidence":"Drosophila genetics, domain-specific expression rescue, immunofluorescence","pmids":["33370260"],"confidence":"High","gaps":["Whether DZIP1 recruitment mechanism is conserved in vertebrates not shown","How N-terminal membrane binding and DZIP1 recruitment are coordinated unresolved"]},{"year":2021,"claim":"Super-resolution microscopy resolved CEP290 distribution throughout the connecting cilium of photoreceptors with nine-fold symmetry, and showed that severe deficiency reduces cilia number but does not prevent initial Y-link assembly, refining the structural model.","evidence":"STORM/STED, electron microscopy, multiple Cep290-deficient mouse models","pmids":["34520396"],"confidence":"High","gaps":["Atomic-resolution structure of CEP290 within Y-links unresolved","Whether nine-fold arrangement requires oligomerization partners not determined"]},{"year":2024,"claim":"Cooperative recruitment of CEP290 to the basal body by axoneme-proximal (Cep131-Cep162) and membrane-proximal (Cby-Fam92) modules was defined, explaining how CEP290 is positioned between microtubules and membrane.","evidence":"Drosophila double-mutant genetic analysis with immunofluorescence","pmids":["38442096"],"confidence":"High","gaps":["Whether these modules have vertebrate functional equivalents not tested","Direct physical contacts between modules and CEP290 domains not mapped"]},{"year":2025,"claim":"Advanced EM in Cep290-mutant mouse retinas showed that ciliogenesis still occurs without CEP290 but the connecting cilium membrane is aberrant, Y-links and TZ proteins are confined proximally, disc formation is blocked, and extracellular vesicles accumulate, demonstrating CEP290 extends TZ organization along the cilium length.","evidence":"Advanced electron microscopy with developmental time-course in Cep290-mutant mouse retinas","pmids":["40704549"],"confidence":"High","gaps":["Whether ectopic vesicle release is a direct consequence of lost gating or membrane instability unclear","Whether pharmacological approaches can restore TZ extension untested"]},{"year":null,"claim":"The atomic structure of CEP290 within the transition zone, the precise mechanism by which it discriminates between allowed and excluded ciliary cargoes, and the molecular basis of its nuclear/replication stress function remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structural model of full-length CEP290 or its TZ complex exists","Cargo selectivity mechanism unknown at molecular level","Nuclear function of CEP290 not distinguished from indirect centriolar/centrosomal effects"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,6,9]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[9]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[6,27,29]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,1,2,3,16]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,6,7,15,16,27,29]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,9]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,6,15,22,25,29,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,19,31]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[18]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[8,10,13]}],"complexes":["CP110-CEP97-CEP290","PCM1-CEP290 centriolar satellite complex","MKS module (transition zone)"],"partners":["RPGR","NPHP5","PCM1","CP110","BBS4","MKKS","CC2D2A","DZIP1"],"other_free_text":[]},"mechanistic_narrative":"CEP290 is a large coiled-coil centrosomal and ciliary protein that functions as a central organizer of the transition zone and a selective gatekeeper controlling the entry and exit of signaling molecules into cilia. It localizes with nine-fold symmetry between axonemal microtubule doublets and the ciliary membrane at the Y-linker region, directly binding microtubules via a myosin-tail homology domain and cellular membranes via an N-terminal amphipathic helix; its activity is regulated by N- and C-terminal autoinhibitory domains [PMID:24051377, PMID:20819941, PMID:40704549]. CEP290 initiates transition zone assembly by recruiting DZIP1, Chibby, and Rab8, interacts with PCM-1 at centriolar satellites to regulate BBSome trafficking, and forms functionally important complexes with NPHP5, CP110, RPGR, CC2D2A, and MKKS; loss of CEP290 disrupts the ciliary diffusion barrier, causing selective mislocalization of signaling proteins such as ARL13B, ADCY3, Smoothened, and GPR161 and augmented Hedgehog signaling [PMID:33370260, PMID:18772192, PMID:28700940, PMID:26982032]. Mutations in CEP290 cause Joubert syndrome and allied ciliopathies including retinal degeneration, nephronophthisis, and cerebellar malformations, and CEP290 deficiency additionally induces DNA replication stress with increased DNA damage, supernumerary centrioles, and decreased replication fork velocity that are rescued by CDK inhibition [PMID:16682970, PMID:26301811]."},"prefetch_data":{"uniprot":{"accession":"O15078","full_name":"Centrosomal protein of 290 kDa","aliases":["Bardet-Biedl syndrome 14 protein","Cancer/testis antigen 87","CT87","Nephrocystin-6","Tumor antigen se2-2"],"length_aa":2479,"mass_kda":290.4,"function":"Involved in early and late steps in cilia formation. Its association with CCP110 is required for inhibition of primary cilia formation by CCP110 (PubMed:18694559). May play a role in early ciliogenesis in the disappearance of centriolar satellites and in the transition of primary ciliar vesicles (PCVs) to capped ciliary vesicles (CCVs). Required for the centrosomal recruitment of RAB8A and for the targeting of centriole satellite proteins to centrosomes such as of PCM1 (PubMed:24421332). Required for the correct localization of ciliary and phototransduction proteins in retinal photoreceptor cells; may play a role in ciliary transport processes (By similarity). Required for efficient recruitment of RAB8A to primary cilium (PubMed:17705300). In the ciliary transition zone is part of the tectonic-like complex which is required for tissue-specific ciliogenesis and may regulate ciliary membrane composition (By similarity). Involved in regulation of the BBSome complex integrity, specifically for presence of BBS2, BBS5 and BBS8/TTC8 in the complex, and in ciliary targeting of selected BBSome cargos. May play a role in controlling entry of the BBSome complex to cilia possibly implicating IQCB1/NPHP5 (PubMed:25552655). Activates ATF4-mediated transcription (PubMed:16682973)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriolar satellite; Nucleus; Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cytoplasmic vesicle","url":"https://www.uniprot.org/uniprotkb/O15078/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CEP290","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CEP290","total_profiled":1310},"omim":[{"mim_id":"620248","title":"TRANSMEMBRANE PROTEIN 80; TMEM80","url":"https://www.omim.org/entry/620248"},{"mim_id":"619988","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 77; MRT77","url":"https://www.omim.org/entry/619988"},{"mim_id":"619287","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 66; CCDC66","url":"https://www.omim.org/entry/619287"},{"mim_id":"619285","title":"TRANSMEMBRANE PROTEIN 218; TMEM218","url":"https://www.omim.org/entry/619285"},{"mim_id":"619111","title":"COACH SYNDROME 2; COACH2","url":"https://www.omim.org/entry/619111"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Centrosome","reliability":"Approved"},{"location":"Basal body","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CEP290"},"hgnc":{"alias_symbol":["KIAA0373","FLJ13615","3H11Ag","rd16","NPHP6","JBTS5","SLSN6","LCA10","MKS4","BBS14","CT87","POC3"],"prev_symbol":[]},"alphafold":{"accession":"O15078","domains":[{"cath_id":"-","chopping":"212-341_353-389","consensus_level":"medium","plddt":70.1602,"start":212,"end":389},{"cath_id":"1.10.287,1.10.287","chopping":"1205-1339","consensus_level":"medium","plddt":70.9493,"start":1205,"end":1339},{"cath_id":"1.20.5","chopping":"871-954","consensus_level":"medium","plddt":71.6533,"start":871,"end":954}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15078","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15078-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15078-F1-predicted_aligned_error_v6.png","plddt_mean":60.53},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CEP290","jax_strain_url":"https://www.jax.org/strain/search?query=CEP290"},"sequence":{"accession":"O15078","fasta_url":"https://rest.uniprot.org/uniprotkb/O15078.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15078/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15078"}},"corpus_meta":[{"pmid":"16909394","id":"PMC_16909394","title":"Mutations 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clinical comparison with Joubert syndrome and its related diseases.","date":"2017","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/29217415","citation_count":11,"is_preprint":false},{"pmid":"20500714","id":"PMC_20500714","title":"Effects of hereditary retinal degeneration due to a CEP290 mutation on the feline pupillary light reflex.","date":"2010","source":"Veterinary ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/20500714","citation_count":10,"is_preprint":false},{"pmid":"23954617","id":"PMC_23954617","title":"12q21 Microdeletion in a fetus with Meckel syndrome involving CEP290/MKS4.","date":"2013","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23954617","citation_count":10,"is_preprint":false},{"pmid":"15474516","id":"PMC_15474516","title":"Subcellullar localization of tumor-associated antigen 3H11Ag.","date":"2004","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15474516","citation_count":9,"is_preprint":false},{"pmid":"33105651","id":"PMC_33105651","title":"A Mild Phenotype Caused by Two Novel Compound Heterozygous Mutations in CEP290.","date":"2020","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/33105651","citation_count":8,"is_preprint":false},{"pmid":"38442096","id":"PMC_38442096","title":"Cep131-Cep162 and Cby-Fam92 complexes cooperatively maintain Cep290 at the basal body and contribute to ciliogenesis initiation.","date":"2024","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/38442096","citation_count":7,"is_preprint":false},{"pmid":"24850569","id":"PMC_24850569","title":"Two novel mutations in the C-terminal region of centrosomal protein 290 (CEP290) result in classic Joubert syndrome.","date":"2014","source":"Journal of child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/24850569","citation_count":7,"is_preprint":false},{"pmid":"34196201","id":"PMC_34196201","title":"CEP104 and CEP290; Genes with Ciliary Functions Cause Intellectual Disability in Multiple Families.","date":"2021","source":"Archives of Iranian medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34196201","citation_count":6,"is_preprint":false},{"pmid":"30930621","id":"PMC_30930621","title":"The ciliopathy gene product Cep290 is required for primary cilium formation and microtubule network organization.","date":"2018","source":"Turkish journal of biology = Turk biyoloji dergisi","url":"https://pubmed.ncbi.nlm.nih.gov/30930621","citation_count":6,"is_preprint":false},{"pmid":"38881603","id":"PMC_38881603","title":"Twelve-month Natural History Study of Centrosomal Protein 290 (CEP290)-associated Inherited Retinal Degeneration.","date":"2024","source":"Ophthalmology science","url":"https://pubmed.ncbi.nlm.nih.gov/38881603","citation_count":6,"is_preprint":false},{"pmid":"34196655","id":"PMC_34196655","title":"Spectrum of Disease Severity in Nonsyndromic Patients With Mutations in the CEP290 Gene: A Multicentric Longitudinal Study.","date":"2021","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/34196655","citation_count":6,"is_preprint":false},{"pmid":"26165328","id":"PMC_26165328","title":"Leber congenital amaurosis: first genotyped Hungarian patients and report of 2 novel mutations in the CRB1 and CEP290 genes.","date":"2015","source":"European journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/26165328","citation_count":6,"is_preprint":false},{"pmid":"28690834","id":"PMC_28690834","title":"From disease modelling to personalised therapy in patients with CEP290 mutations.","date":"2017","source":"F1000Research","url":"https://pubmed.ncbi.nlm.nih.gov/28690834","citation_count":6,"is_preprint":false},{"pmid":"32208788","id":"PMC_32208788","title":"Investigation of CEP290 genotype-phenotype correlations in a patient with retinitis pigmentosa, infertility, end-stage renal disease, and a novel mutation.","date":"2020","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32208788","citation_count":5,"is_preprint":false},{"pmid":"36495011","id":"PMC_36495011","title":"Alternative splicing in CEP290 mutant cats results in a milder phenotype than LCACEP290 patients.","date":"2022","source":"Veterinary ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/36495011","citation_count":5,"is_preprint":false},{"pmid":"32600475","id":"PMC_32600475","title":"Novel biallelic loss-of-function variants in CEP290 cause Joubert syndrome in two siblings.","date":"2020","source":"Human genomics","url":"https://pubmed.ncbi.nlm.nih.gov/32600475","citation_count":5,"is_preprint":false},{"pmid":"39213781","id":"PMC_39213781","title":"Spectrum and frequencies of extraocular features reported in CEP290-associated ciliopathy - A systematic review.","date":"2024","source":"Journal francais d'ophtalmologie","url":"https://pubmed.ncbi.nlm.nih.gov/39213781","citation_count":4,"is_preprint":false},{"pmid":"40704549","id":"PMC_40704549","title":"Sub-ciliary localization of CEP290 and effects of its loss in mouse photoreceptors during development.","date":"2025","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/40704549","citation_count":4,"is_preprint":false},{"pmid":"35352487","id":"PMC_35352487","title":"Evaluation of novel compound variants of CEP290 in prenatally suspected case of Meckel syndrome through whole exome sequencing.","date":"2022","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35352487","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48528,"output_tokens":7397,"usd":0.12827},"stage2":{"model":"claude-opus-4-6","input_tokens":11116,"output_tokens":3612,"usd":0.21882},"total_usd":0.34709,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"CEP290 localizes to centrosomes in dividing cells and to the connecting cilium of retinal photoreceptors, where it associates with microtubule-based transport proteins including RPGR; an in-frame deletion in CEP290 (rd16 mouse) causes stronger association with specific RPGR isoforms and redistribution of RPGR and phototransduction proteins in photoreceptors, implicating CEP290 in ciliary transport.\",\n      \"method\": \"Immunolocalization, co-immunoprecipitation, immunogold electron microscopy, mouse genetic model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, immunogold EM, genetic model) in a single rigorous study\",\n      \"pmids\": [\"16632484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CEP290 expression shows centrosome and ciliary localization, linking it to ciliopathies; mutations in CEP290 cause pleiotropic Joubert syndrome features including cerebellar, retinal, and renal manifestations.\",\n      \"method\": \"Expression analysis, immunolocalization in cerebellar granule neurons\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization experiment but limited functional mechanistic follow-up\",\n      \"pmids\": [\"16682970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CEP290 physically interacts with the centriolar satellite protein PCM-1; CEP290 localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner; depletion of CEP290 disrupts PCM-1 distribution and protein complex formation, disorganizes the cytoplasmic microtubule network, impairs ciliogenesis, and prevents ciliary targeting of Rab8.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus multiple functional readouts (microtubule organization, ciliogenesis, Rab8 localization)\",\n      \"pmids\": [\"18772192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CP110 interacts with CEP290 in a discrete complex separable from other CP110 complexes; this interaction is required for CP110 to suppress primary cilia formation; CEP290 and CP110 also interact with Rab8a, and depletion of CEP290 prevents Rab8a localization to centrosomes and cilia, blocking ciliogenesis without affecting centrosome function or cell-cycle progression.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with multiple functional assays showing epistatic relationship between CP110 and CEP290\",\n      \"pmids\": [\"18694559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CC2D2A physically interacts with CEP290 at the basal body as shown by yeast two-hybrid and GST pull-down; knockdown of cep290 in cc2d2a-mutant zebrafish produces a synergistic pronephric cyst phenotype, revealing a genetic interaction between the two proteins.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, zebrafish genetic epistasis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro reconstitution (GST pulldown) plus in vivo genetic epistasis\",\n      \"pmids\": [\"18950740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The N-terminal domain of nephrocystin-6 (CEP290) directly binds nephrocystin-5 (NPHP5); mapping studies delineated the interaction site to amino acids 696–896 of NPHP6; expression of the nephrocystin-5-binding fragment of nephrocystin-6 in Xenopus phenocopies NPHP5 knockdown and is rescued by co-expression of nephrocystin-5, supporting a physical interaction in vivo; N- and C-terminal fragments of nephrocystin-6 form homo- and heteromeric complexes.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, Xenopus morpholino knockdown and rescue, zebrafish knockdown\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain-level mapping plus in vivo epistasis in two model organisms\",\n      \"pmids\": [\"18723859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Chlamydomonas, CEP290 is located in the flagellar transition zone in close association with microtubule-membrane links; deletion of CEP290 causes loss of attachment of the flagellar membrane to transition zone microtubules, produces abnormal flagellar protein content (including IFT proteins and ciliopathy-associated proteins), and CEP290 at the transition zone undergoes rapid turnover. CEP290 is required to form microtubule-membrane linkers and to control flagellar protein composition.\",\n      \"method\": \"Immunoelectron microscopy, ultrastructural analysis, biochemical fractionation of isolated flagella, dikaryon experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ultrastructural and biochemical reconstitution in a genetic deletion model with multiple orthogonal methods\",\n      \"pmids\": [\"20819941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In olfactory sensory neurons, CEP290 localizes to dendritic knobs and is in complex with ciliary transport proteins and olfactory G proteins Golf and Gγ13; hypomorphic CEP290 mutation (rd16) causes selective loss of ciliary localization of Golf and Gγ13 but not of odorant receptors or other signaling components, implicating CEP290 as a key mediator of selective G protein trafficking into olfactory cilia.\",\n      \"method\": \"Electro-olfactogram recordings, co-immunoprecipitation, immunofluorescence, mouse genetic model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus functional electrophysiology plus selective localization phenotype in genetic model\",\n      \"pmids\": [\"17898177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cep72 is required for recruitment of CEP290 to centriolar satellites; interactions between PCM1, Cep72, and Cep290 were identified; disruption of centriolar satellites impairs ciliary localization of BBS4 in a Cep290- and Cep72-dependent manner, indicating that Cep290 and Cep72 in centriolar satellites regulate ciliary localization of the BBSome.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish loss-of-function\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional ciliogenesis and BBSome trafficking assays\",\n      \"pmids\": [\"22767577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CEP290 directly binds cellular membranes through an N-terminal amphipathic helix domain and binds microtubules through a domain within its myosin-tail homology domain; CEP290 activity is regulated by two autoinhibitory domains in its N and C termini; disruption of the microtubule-binding domain in a mouse model induces cilia formation deficits leading to retinal degeneration.\",\n      \"method\": \"In vitro membrane-binding assay, microtubule-binding assay, domain mutagenesis, mouse genetic model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assays with domain mutagenesis validated in vivo in mouse model\",\n      \"pmids\": [\"24051377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The BBSome binds to the N-terminal region of CEP290 through BBS4 and co-localizes with CEP290 at the transition zone, centriolar satellites, and connecting cilium; in BBSome-depleted cells, CEP290 localization to centriolar satellites is disrupted; genetic interaction was demonstrated: additional loss of Bbs4 alleles in Cep290rd16 mice accelerates photoreceptor degeneration and increases body weight, and double-heterozygous mice show increased body weight.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, mouse genetic epistasis (Cep290rd16 × Bbs4-null crosses)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus in vivo genetic interaction with quantitative phenotypic readouts\",\n      \"pmids\": [\"23943788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The domain deleted in the Cep290rd16 protein directly interacts with MKKS; MKKS mutations found in Bardet-Biedl syndrome patients disrupt this interaction; combined subminimal knockdown of mkks and cep290 in zebrafish produces synergistic sensory defects; combinations of Cep290rd16 and Mkksko alleles in mice led to improved ciliogenesis and sensory functions compared with either mutant alone, suggesting that CEP290–MKKS interaction affects integrity of multiprotein complexes at the cilia transition zone.\",\n      \"method\": \"Co-immunoprecipitation, zebrafish genetic epistasis, mouse double-mutant crosses, ciliogenesis assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding mapped to specific domain, validated by reciprocal epistasis in two model organisms\",\n      \"pmids\": [\"22446187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CEP290 depletion leads to accumulation of its novel interacting partner Rkip (Raf-1 kinase inhibitory protein); ectopic accumulation of Rkip causes defective cilia formation mediated by its interaction with the ciliary GTPase Rab8A, suggesting that Rkip prevents cilia formation downstream of CEP290.\",\n      \"method\": \"Co-immunoprecipitation, zebrafish morpholino knockdown, cell-based ciliogenesis assays, rd16 mouse model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus in vivo phenocopy, but mechanistic link from CEP290 to Rkip to Rab8A shown in separate experiments\",\n      \"pmids\": [\"21685394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome; Cep290 directly binds NPHP5, and depletion of Cep290 causes dissociation of BBS8 from the BBSome and loss of ciliary BBS8 in addition to the BBS2/5 loss caused by NPHP5 depletion; selective impairment of BBSome cargo (smoothened, VPAC2, Rab8a) delivery to cilia occurs upon NPHP5 or Cep290 loss.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated plus multiple functional readouts of BBSome integrity and cargo trafficking\",\n      \"pmids\": [\"25552655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Pathogenic NPHP5 truncating mutations produce products unable to bind Cep290 and unable to localize to centrosomes, thereby blocking cilia formation; drugs antagonizing negative regulators of ciliogenesis rescue ciliation in NPHP5-depleted cells with response profiles similar to those of Cep290-depleted cells, placing NPHP5 and Cep290 in the same early ciliogenic pathway.\",\n      \"method\": \"Co-immunoprecipitation, domain mutagenesis, siRNA knockdown, pharmacological rescue, ciliogenesis assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — direct binding with mutagenesis plus pharmacological epistasis\",\n      \"pmids\": [\"23446637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In C. elegans, CEP-290 is a central assembly factor specific to MKS module components at the transition zone, depending on the coiled-coil region of MKS-5 (RPGRIP1L) for TZ localization; CEP-290 prevents inappropriate entry of membrane-associated proteins into cilia and prevents ARL-13 from leaking out of cilia; CEP-290-dependent TZ localization was established for TMEM-218, TMEM-138, and CDKL-1.\",\n      \"method\": \"C. elegans genetic deletion, immunofluorescence localization hierarchies, fluorescent protein reporters for ciliary gating\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic hierarchy established with multiple proteins in a genetic model organism with functional gating assays\",\n      \"pmids\": [\"26982032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CEP290 localizes precisely to the transition zone Y-linker region between central microtubules and plasma membrane; Cep290ko/ko mice lacking CEP290 protein have photoreceptors that lack connecting cilia and fail to mature ciliated ventricular ependyma; partial loss of CEP290-interacting ciliopathy protein MKKS mitigates lethality and renal pathology in Cep290gt/gt mice, indicating domain-specific genetic interactions.\",\n      \"method\": \"Immunofluorescence, mouse genetic knockout, light and electron microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization to Y-linkers with in vivo loss-of-function and genetic rescue\",\n      \"pmids\": [\"25859007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phenotypic expression of Rpgr-loss in mice is modified by heterozygous hypomorphic but not null alleles of Cep290; physical interaction between RPGR and the C-terminal domain of CEP290 was demonstrated; Rpgrko/Y::Cep290rd16/+ mice show early-onset retinal degeneration with disorganized outer segments and defective opsin trafficking.\",\n      \"method\": \"Co-immunoprecipitation, mouse double-mutant crosses, immunofluorescence, electroretinography\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP mapping to specific domain plus quantitative in vivo genetic interaction\",\n      \"pmids\": [\"26936822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNA replication stress underlies renal phenotypes in CEP290-associated ciliopathy; reduction of CEP290 in kidney cells and zebrafish leads to enhanced DNA damage signaling, DNA breaks, supernumerary centrioles, decreased replication fork velocity, fork asymmetry, and increased CDK levels; CDK inhibitor treatment rescues DNA damage, centriole number, and primary cilia loss in Cep290-deficient cells.\",\n      \"method\": \"DNA fiber assay, γH2AX staining, CDK inhibitor treatment, 3D spheroid culture, zebrafish knockdown\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods linking CEP290 to DNA replication stress with pharmacological rescue\",\n      \"pmids\": [\"26301811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CEP290 acts as a selective ciliary gatekeeper: in JSRD patient fibroblasts lacking CEP290, cilia are abnormal with decreased ciliogenesis and selectively reduced localization of ADCY3 and ARL13B; Hedgehog signaling is augmented due to enhanced ciliary transport of Smoothened and GPR161, demonstrating that CEP290 controls selective entry and exit of signaling molecules at the ciliary gate.\",\n      \"method\": \"iPSC-derived optic cups and fibroblasts from patients, immunofluorescence, ciliogenesis quantification, Hedgehog signaling assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived cells with multiple orthogonal functional assays demonstrating gatekeeper role\",\n      \"pmids\": [\"28700940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SSX2IP localizes to the basal body of primary cilia and is required for efficient recruitment of Cep290 to centriolar satellites and the basal body; loss of SSX2IP impairs BBSome entry into cilia, reduces Rab8 accumulation, and reduces ciliary targeting of somatostatin receptor 3.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, co-immunoprecipitation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — localization dependency established by knockdown with multiple functional readouts\",\n      \"pmids\": [\"24356449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCDC66 is a centriolar satellite protein that interacts with CEP290 and PCM1 as shown by co-immunoprecipitation; depletion of CCDC66 impairs ciliogenesis, ciliary recruitment of BBS4, and centriolar satellite organization.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus multiple functional knockdown readouts from a single lab\",\n      \"pmids\": [\"28235840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Talpid3 and Cep290 play overlapping and distinct roles in cilia formation: both affect Rab8a localization and centriolar satellite dynamics; ultrastructural analyses show Talpid3 is required for centriolar satellite dispersal preceding mature ciliary vesicle formation, a process requiring Cep290; expression of activated Rab8a suppresses cilia assembly defects caused by Talpid3 depletion.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, electron microscopy, activated Rab8a rescue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ultrastructural analysis plus genetic rescue experiments defining pathway order\",\n      \"pmids\": [\"24421332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A CEP290 C-terminal fragment (989 residues including the domain deleted in rd16 mice) delivered by AAV complements mutant CEP290 in trans, rescuing cone preservation, delaying rod death, improving cilia phenotypes in mouse embryonic fibroblasts, and improving photoreceptor outer segments in iPSC-derived retinal organoids.\",\n      \"method\": \"AAV gene delivery, mouse in vivo rescue (Cep290rd16 and rd16;Nrl-/- models), electroretinography, histology, iPSC-derived organoids\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain-specific functional rescue in multiple models with quantitative readouts\",\n      \"pmids\": [\"30332642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The N-terminal region of human CEP290 protein is sufficient to restore visual function in cep290 morpholino-injected zebrafish; cep290 morphants exhibit reduced Kupffer's vesicle size and delayed melanosome transport phenotypes similar to bbs knockdowns.\",\n      \"method\": \"Zebrafish morpholino knockdown, mRNA rescue, visual function assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain-level rescue in vivo, single organism\",\n      \"pmids\": [\"21257638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Drosophila, the N-terminus of CEP290 directly recruits DZIP1, which then recruits Chibby and Rab8 to promote early ciliary membrane formation; complete deletion of CEP290 blocks ciliogenesis at the transition zone assembly initiation stage, phenocopied by DZIP1 deletion; expression of CEP290 N-terminus alone restores DZIP1 TZ localization and ameliorates TZ assembly initiation defects.\",\n      \"method\": \"Drosophila genetics, in vivo rescue, immunofluorescence, domain-specific expression\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic pathway ordering with domain-specific rescue in a genetic model organism\",\n      \"pmids\": [\"33370260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rpgrip1l controls ciliary gating by ensuring the proper amount of CEP290 at the vertebrate transition zone; reduction of Rpgrip1l leads to decreased CEP290 at the TZ; the flavonoid eupatilin rescues ciliary gating defects caused by Rpgrip1l loss.\",\n      \"method\": \"Immunofluorescence in mouse and zebrafish models, pharmacological rescue\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-level dependency shown in vivo with pharmacological rescue, single study\",\n      \"pmids\": [\"33625872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Using super-resolution fluorescence microscopy, CEP290 localizes radially between microtubule doublets and the ciliary membrane throughout the full length of the connecting cilium in photoreceptors, but is confined to the very base of primary cilia in RPE1 cells; severe CEP290 deficiency reduces cilia number and prevents normal outer segment formation but does not prevent assembly of Y-shaped links in early stages.\",\n      \"method\": \"Super-resolution fluorescence microscopy (STORM/STED), electron microscopy, CEP290-deficient mouse models\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — sub-diffraction localization with structural validation and multiple mutant mouse models\",\n      \"pmids\": [\"34520396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"During aggresome assembly, the seeding of an initial phosphorylated HSP27 ring at the centrosome depends on CP110, CEP97, and CEP290; centriolar satellites are required for aggresome growth from this ring; CP110-CEP97-CEP290 and satellites are also required for aggregation of mutant huntingtin.\",\n      \"method\": \"High-resolution quantitative microscopy, siRNA knockdown, aggresome formation assays in human cells\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — specific complex identified with functional aggresome assembly readout, single study\",\n      \"pmids\": [\"35411088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Using advanced microscopy, CEP290 is found throughout the connecting cilium with nine-fold symmetry between microtubules and membrane; in the absence of CEP290, ciliogenesis occurs but the connecting cilium membrane is aberrant, ciliary necklace and Y-links are confined to the proximal connecting cilium, TZ proteins AHI1 and NPHP1 are abnormally restricted to the proximal connecting cilium, outer segment disc formation is inhibited, and large numbers of extracellular vesicles form.\",\n      \"method\": \"Advanced electron microscopy, immunofluorescence, Cep290 mutant mouse retinas, developmental time-course\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structural analysis plus multiple functional consequences in genetic mouse model\",\n      \"pmids\": [\"40704549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Cep131-Cep162 module (near the axoneme) and the Cby-Fam92 module (close to the membrane) synergistically control basal body localization of CEP290 and ciliogenesis initiation in Drosophila; concurrent deletion of any protein from both modules causes complete loss of CEP290 from the basal body and blocks ciliogenesis at its initiation stage.\",\n      \"method\": \"Drosophila genetics, immunofluorescence, double-mutant analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple double-mutant combinations defining cooperative localization pathway\",\n      \"pmids\": [\"38442096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A rare CEP290 missense variant (R1747Q/R1746Q) disrupts the ciliary diffusion barrier, causes mislocalization of the Shh receptor Smoothened, dysregulates ciliary protein mobility, and impairs proliferation of cerebellar granule progenitors; confirmed in an autism patient-derived iPSC line.\",\n      \"method\": \"FRAP, immunofluorescence, Hedgehog signaling assays, mouse and iPSC models\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FRAP plus functional signaling assays in both mouse and human iPSC model\",\n      \"pmids\": [\"30478281\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CEP290 is a large coiled-coil protein that localizes to the transition zone (TZ) Y-linker region between axonemal microtubules and the ciliary membrane, where it acts as a selective gatekeeper controlling entry and exit of signaling molecules; it directly binds microtubules via a myosin-tail homology domain and cellular membranes via an N-terminal amphipathic helix, recruits DZIP1/Chibby/Rab8 to initiate TZ assembly, interacts physically with RPGR, NPHP5, PCM-1, CP110, BBS4 (BBSome), and MKKS to regulate centriolar satellite dynamics, ciliogenesis, and ciliary cargo trafficking, and also has a nuclear function linked to DNA replication stress control.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CEP290 is a large coiled-coil centrosomal and ciliary protein that functions as a central organizer of the transition zone and a selective gatekeeper controlling the entry and exit of signaling molecules into cilia. It localizes with nine-fold symmetry between axonemal microtubule doublets and the ciliary membrane at the Y-linker region, directly binding microtubules via a myosin-tail homology domain and cellular membranes via an N-terminal amphipathic helix; its activity is regulated by N- and C-terminal autoinhibitory domains [PMID:24051377, PMID:20819941, PMID:40704549]. CEP290 initiates transition zone assembly by recruiting DZIP1, Chibby, and Rab8, interacts with PCM-1 at centriolar satellites to regulate BBSome trafficking, and forms functionally important complexes with NPHP5, CP110, RPGR, CC2D2A, and MKKS; loss of CEP290 disrupts the ciliary diffusion barrier, causing selective mislocalization of signaling proteins such as ARL13B, ADCY3, Smoothened, and GPR161 and augmented Hedgehog signaling [PMID:33370260, PMID:18772192, PMID:28700940, PMID:26982032]. Mutations in CEP290 cause Joubert syndrome and allied ciliopathies including retinal degeneration, nephronophthisis, and cerebellar malformations, and CEP290 deficiency additionally induces DNA replication stress with increased DNA damage, supernumerary centrioles, and decreased replication fork velocity that are rescued by CDK inhibition [PMID:16682970, PMID:26301811].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of CEP290 as a centrosomal/ciliary protein whose mutation causes ciliopathy established the gene as a ciliary transport regulator and linked it to Joubert syndrome.\",\n      \"evidence\": \"Immunolocalization, immunogold EM, co-IP with RPGR in mouse retina; expression analysis in cerebellar granule neurons with patient mutation screening\",\n      \"pmids\": [\"16632484\", \"16682970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of CEP290-RPGR interaction unresolved\", \"Subciliary localization not yet resolved at nanoscale\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that CEP290 selectively mediates G protein trafficking into olfactory cilia revealed it acts as a cargo-selective gate rather than a general transport factor.\",\n      \"evidence\": \"Electro-olfactograms, co-IP with Golf/Gγ13, immunofluorescence in rd16 mouse olfactory neurons\",\n      \"pmids\": [\"17898177\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CEP290 discriminates between cargo proteins unknown\", \"Structural basis for selectivity unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"A series of studies mapped CEP290 into a physical interaction network with PCM-1, CP110, NPHP5, CC2D2A, and Rab8a, establishing it as a hub connecting centriolar satellites, the mother centriole cap, and ciliogenesis initiation.\",\n      \"evidence\": \"Reciprocal co-IP, domain mapping, siRNA knockdown with ciliogenesis and Rab8 localization assays, yeast two-hybrid, GST pull-down, zebrafish genetic epistasis\",\n      \"pmids\": [\"18772192\", \"18694559\", \"18950740\", \"18723859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and temporal order of complex assembly at the basal body undefined\", \"Whether CP110-CEP290 and PCM1-CEP290 complexes coexist or are mutually exclusive unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Ultrastructural analysis in Chlamydomonas established that CEP290 forms the physical microtubule-membrane links at the transition zone and controls flagellar protein composition, providing the first structural evidence for its gatekeeper role.\",\n      \"evidence\": \"Immunoelectron microscopy, biochemical fractionation of isolated flagella, dikaryon rescue in CEP290-deletion Chlamydomonas\",\n      \"pmids\": [\"20819941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same ultrastructural role is conserved in vertebrate TZ not yet shown at this point\", \"Molecular architecture of the Y-link with CEP290 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that CEP290 at centriolar satellites controls BBSome ciliary entry (via Cep72) and that CEP290-MKKS interaction modulates TZ complex integrity revealed how CEP290 coordinates satellite dynamics with ciliary trafficking.\",\n      \"evidence\": \"Co-IP, siRNA and zebrafish knockdown, mouse double-mutant crosses (Cep290rd16 × Mkks-ko)\",\n      \"pmids\": [\"22767577\", \"22446187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MKKS-CEP290 balance is mechanistically set at the TZ unknown\", \"Whether satellite-independent CEP290 functions exist at the TZ not distinguished\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Biochemical reconstitution revealed CEP290 directly binds membranes via an N-terminal amphipathic helix and microtubules via a myosin-tail homology domain, with two autoinhibitory domains regulating these activities, providing the first molecular-level mechanism for its bridge function.\",\n      \"evidence\": \"In vitro membrane-binding and microtubule-binding assays, domain mutagenesis, mouse genetic model with retinal degeneration\",\n      \"pmids\": [\"24051377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for autoinhibition and its relief unknown\", \"Whether post-translational modifications regulate domain switching untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Multiple studies defined the BBSome-CEP290-NPHP5 axis: BBS4 binds CEP290 N-terminus; CEP290 and NPHP5 jointly maintain BBSome integrity and are placed in the same early ciliogenic pathway by pharmacological epistasis.\",\n      \"evidence\": \"Co-IP, domain mapping, mouse genetic epistasis (Cep290rd16 × Bbs4-null), pharmacological rescue screens, ciliary cargo assays\",\n      \"pmids\": [\"23943788\", \"23446637\", \"25552655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CEP290 acts catalytically or purely as a scaffold for BBSome assembly unclear\", \"Direct structural complex of CEP290-NPHP5-BBSome not reconstituted\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"CEP290 was localized precisely to the Y-linker substructure of the transition zone, and CEP290 depletion was found to cause DNA replication stress independent of its ciliary role, revealing a nuclear/cell-cycle function.\",\n      \"evidence\": \"Immunofluorescence and EM in mouse knockout; DNA fiber assays, γH2AX staining, CDK inhibitor rescue in kidney cells and zebrafish\",\n      \"pmids\": [\"25859007\", \"26301811\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CEP290 regulates replication fork stability unknown\", \"Whether nuclear CEP290 function is direct or mediated by centriole/centrosome defects unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"C. elegans epistasis hierarchies showed CEP290 is a central MKS-module assembly factor that prevents inappropriate entry of membrane-associated proteins and leakage of ARL-13 from cilia, consolidating the gatekeeper model across species.\",\n      \"evidence\": \"C. elegans genetic deletions, localization hierarchy mapping, fluorescent ciliary gating reporters\",\n      \"pmids\": [\"26982032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CEP290 physically contacts each MKS component or acts indirectly not distinguished\", \"Gating selectivity mechanism at molecular level unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Patient-derived cells demonstrated that CEP290 loss selectively reduces ciliary ADCY3 and ARL13B while augmenting Smoothened and GPR161 transport, confirming bidirectional gatekeeper function in human disease-relevant tissue.\",\n      \"evidence\": \"iPSC-derived optic cups and fibroblasts from Joubert syndrome patients, Hedgehog signaling assays\",\n      \"pmids\": [\"28700940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether augmented Hedgehog signaling directly drives cerebellar phenotype not tested\", \"Mechanism discriminating cargo allowed vs. excluded at the gate unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Drosophila studies defined the earliest CEP290-dependent step in TZ assembly: the N-terminus recruits DZIP1, which then recruits Chibby and Rab8 to initiate ciliary membrane formation, ordering the pathway.\",\n      \"evidence\": \"Drosophila genetics, domain-specific expression rescue, immunofluorescence\",\n      \"pmids\": [\"33370260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DZIP1 recruitment mechanism is conserved in vertebrates not shown\", \"How N-terminal membrane binding and DZIP1 recruitment are coordinated unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Super-resolution microscopy resolved CEP290 distribution throughout the connecting cilium of photoreceptors with nine-fold symmetry, and showed that severe deficiency reduces cilia number but does not prevent initial Y-link assembly, refining the structural model.\",\n      \"evidence\": \"STORM/STED, electron microscopy, multiple Cep290-deficient mouse models\",\n      \"pmids\": [\"34520396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of CEP290 within Y-links unresolved\", \"Whether nine-fold arrangement requires oligomerization partners not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cooperative recruitment of CEP290 to the basal body by axoneme-proximal (Cep131-Cep162) and membrane-proximal (Cby-Fam92) modules was defined, explaining how CEP290 is positioned between microtubules and membrane.\",\n      \"evidence\": \"Drosophila double-mutant genetic analysis with immunofluorescence\",\n      \"pmids\": [\"38442096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these modules have vertebrate functional equivalents not tested\", \"Direct physical contacts between modules and CEP290 domains not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Advanced EM in Cep290-mutant mouse retinas showed that ciliogenesis still occurs without CEP290 but the connecting cilium membrane is aberrant, Y-links and TZ proteins are confined proximally, disc formation is blocked, and extracellular vesicles accumulate, demonstrating CEP290 extends TZ organization along the cilium length.\",\n      \"evidence\": \"Advanced electron microscopy with developmental time-course in Cep290-mutant mouse retinas\",\n      \"pmids\": [\"40704549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ectopic vesicle release is a direct consequence of lost gating or membrane instability unclear\", \"Whether pharmacological approaches can restore TZ extension untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The atomic structure of CEP290 within the transition zone, the precise mechanism by which it discriminates between allowed and excluded ciliary cargoes, and the molecular basis of its nuclear/replication stress function remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structural model of full-length CEP290 or its TZ complex exists\", \"Cargo selectivity mechanism unknown at molecular level\", \"Nuclear function of CEP290 not distinguished from indirect centriolar/centrosomal effects\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 6, 9]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [6, 27, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1, 2, 3, 16]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 6, 7, 15, 16, 27, 29]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 6, 15, 22, 25, 29, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 19, 31]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [8, 10, 13]}\n    ],\n    \"complexes\": [\n      \"CP110-CEP97-CEP290\",\n      \"PCM1-CEP290 centriolar satellite complex\",\n      \"MKS module (transition zone)\"\n    ],\n    \"partners\": [\n      \"RPGR\",\n      \"NPHP5\",\n      \"PCM1\",\n      \"CP110\",\n      \"BBS4\",\n      \"MKKS\",\n      \"CC2D2A\",\n      \"DZIP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}